Strain hardening behaviour and its relationship to tensile mechanical properties of dual phase steel

Abstract

Using the modified Crussard–Jaoul analysis, the strain hardening behaviour of a predeformed 1020 dual phase steel with quenching and quenching plus tempering treatments was examined, showing that this dual phase steel deforms in two stages. The relationships between the maximum uniform strain ε_u, the stress ratio (true initial stress σ₀ true maximum stress σ_u) and the strain hardening exponents in the first stage and the second stage (m₁ and m₂) were derived based on the Swift equation and the Considere instability criterion, which showed good agreement with the experimental results for the present 1020 dual phase steel. The dependence of strength σ_u and ductility ɛ_u of dual phase steel on the exponents m₁ and m₂ was discussed using the two derived relationships.

MST/1631